The last line produces eks_pd.pd which can be loaded into
pd.
In addition to the basic three MIDI-control parameters
(gate, freq, and gain), we have the following
additional parameters that are brought out as sliders in pd:

Brightness

Decay time ()

Dynamic level

Pick position

Pick angle (or direction)

Finally, there are some simply computed parameters associated
purely with panning the output sound into the stereo field: